KR101689077B1 - Method for synchronizing time and time synchronizer - Google Patents

Method for synchronizing time and time synchronizer Download PDF

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KR101689077B1
KR101689077B1 KR1020150052757A KR20150052757A KR101689077B1 KR 101689077 B1 KR101689077 B1 KR 101689077B1 KR 1020150052757 A KR1020150052757 A KR 1020150052757A KR 20150052757 A KR20150052757 A KR 20150052757A KR 101689077 B1 KR101689077 B1 KR 101689077B1
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time
device
correction
error
data
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KR1020150052757A
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Korean (ko)
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KR20160122601A (en
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송동신
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엘에스산전 주식회사
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00Arrangements for synchronising receiver with transmitter
    • H04L7/0016Arrangements for synchronising receiver with transmitter correction of synchronization errors
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J3/00Time-division multiplex systems
    • H04J3/02Details
    • H04J3/06Synchronising arrangements
    • H04J3/0635Clock or time synchronisation in a network
    • H04J3/0638Clock or time synchronisation among nodes; Internode synchronisation
    • H04J3/0658Clock or time synchronisation among packet nodes
    • H04J3/0661Clock or time synchronisation among packet nodes using timestamps
    • H04J3/0664Clock or time synchronisation among packet nodes using timestamps unidirectional timestamps
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J3/00Time-division multiplex systems
    • H04J3/02Details
    • H04J3/06Synchronising arrangements
    • H04J3/0635Clock or time synchronisation in a network
    • H04J3/0685Clock or time synchronisation in a node; Intranode synchronisation
    • H04J3/0697Synchronisation in a packet node
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00Arrangements for synchronising receiver with transmitter
    • H04L7/0004Initialisation of the receiver

Abstract

The invention relates to a time synchronization method and apparatus, and more particularly to a method and apparatus for time synchronization between devices.
A time synchronization method according to the present invention includes: receiving data from a first device; Checking time information of a first device included in the received data; And correcting a time error based on the confirmed time information, wherein the time error correction is corrected by a correction constant according to an error time with the first device.

Description

[0001] The present invention relates to a time synchronization method,

The present invention relates to a method and apparatus for time synchronization, and more particularly to a method and apparatus for time synchronization between devices.

In order to transmit / receive data between devices, synchronization is attempted between the devices. At this time, at least one device associated with the device, based on time information transmitted from a specific one of the devices or the master device, follows the time of the master device.

That is, a master device among devices connected to a communication network transmits a message including a time stamp when transmitting data. In this case, the time stamp may include the time at which the message is transmitted or the time information of the device. The slave devices connected to the master device can perform time synchronization based on the time stamp included in the message received from the master device.

FIG. 1 is a block diagram illustrating a conventional time synchronization operation between devices. Referring to FIG.

Referring to FIG. 1, a communication system including a conventional server 10 and a client 20 can be performed in a software handshaking manner for time synchronization. The software handshaking scheme is such that when the client 20 sends a time request packet to the server 10 in step S11, the server 10 responds to the time request packet from the client 20, As a response packet. (S12)

The client 20 can set the current time based on the following equation (1) based on the local time information received from the server 10. [

[Equation 1]

Current time of client = T + RTT / 2

That is, the client 20 transmits a time request packet to the server 10, and transmits a time request packet to the current time information T of the server included in the response signal, (RTT / 2) excluding the current time (RTT / 2).

Since the time synchronization between devices according to the above-described software handshaking method is required to transmit and receive communication packets between devices, a time error between devices of several ms may occur depending on the data transmitting and receiving apparatus and system. In addition, it is not impossible to implement precise time synchronization in this manner, but when such a scheme is adopted, an additional load of the apparatus is required as communication packet analysis must be processed first. Therefore, there is a restriction on the operation of the system or a time loss may occur therefrom.

Therefore, the present invention provides a time synchronization method and apparatus for efficient time synchronization between devices. The present invention provides a time synchronization method and apparatus capable of minimizing a load required for operation between devices and realizing precise time synchronization.

According to an aspect of the present invention, there is provided a time synchronization method comprising: receiving data from a first device; Checking time information of a first device included in the received data; And correcting a time error based on the confirmed time information, wherein the time error correction is corrected by a correction constant according to an error time with the first device.

The time synchronization method and apparatus according to the present invention can easily perform a time synchronization operation between devices. In addition, it is possible to minimize the operation load between devices, and to maintain time synchronization operation and state precisely and quickly. This can improve the efficiency of correct data transmission and reception and other data processing.

1 is a block diagram illustrating a conventional time synchronization operation.
2 is a block diagram illustrating a time synchronization operation according to an embodiment of the present invention.
3 is a flowchart of a data transmission / reception operation of the first device according to the embodiment of the present invention.
4 is a flowchart of a data transmission / reception operation of a second device according to an embodiment of the present invention;
5 is a flow chart of a time synchronization operation between devices according to an embodiment of the present invention;

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the same components are denoted by the same reference numerals as possible in the accompanying drawings. The detailed description of known functions and configurations that may obscure the subject of the present invention will be omitted.

FIG. 2 is a block diagram illustrating a time synchronization operation according to an embodiment of the present invention. Referring to FIG.

Referring to FIG. 1, a data transmission / reception system 1000 according to an embodiment of the present invention may include a first device 100 and at least one second device 200. The data transmission and reception system 1000 according to the embodiment of the present invention may be configured such that the first device 100 is the master device and the second device is the slave device and the first and second devices are configured as the same device Depending on the system configuration, the master device can be set up flexibly. Therefore, the configuration of the system is not limited. Further, the second device may be composed of a plurality of devices, but is not limited thereto.

The master device 100 may include a first communication unit 110, a first control unit 120, and a first storage unit 130.

The first communication unit 110 may include a first oscillator 111 and a first time corrector 112.

The first oscillator 111 may generate a clock signal and may perform operations of the device based on the generated clock signal. The first oscillator 111 may not be included in the first communication unit 110 but may be separately configured.

The first time correction unit 112 may set the time of the device according to a predetermined period by the signal of the first oscillator 111. [

The first control unit 120 may control the first communication unit 110 to record data to be transmitted in the transmission buffer and receive data to be received in the reception buffer. Also, the first control unit 120 can control to transmit and receive data based on the clock signal of the first communication unit 110. [ Also, the first control unit 120 may check the data received from the slave device 200 and transmit the data including the time information of the master device 100 during data transmission.

The first storage unit 130 may store data that can be transmitted and received between the devices. The first storage unit 130 may store identification information and status information of devices connected to the network. The first storage unit 130 may store time information received from the master device and time correction information according to the time information when the first storage unit 130 operates as a slave device according to the characteristics of the device.

The slave device 200 may have a configuration similar to that of the master device 100. The slave device 200 may include a second communication unit 210, a second control unit 220, and a second storage unit 230.

The second communication unit 210 of the slave device 200 may include a second oscillator 211 and a second time corrector 212.

The second oscillator 211 included in the second communication unit 210 of the slave device 200 may include a second oscillator 211 having the same configuration as that of the master device 100. [ The second oscillator 211 also generates a clock at predetermined intervals and can execute the operation of the slave device 200 according to the clock.

The second time correction unit 212 may correct the time to converge the time of the slave device 200 to the time of the master device 100 based on the time information received from the master device 100. [ In detail, the second time correction unit 212 acquires time information of the master device 100 and transmits the time information and the time correction constant of the slave device 200 to the master device 100, And the time between the slave device 200 can be synchronized. The operation of the second time correction unit 212 and the time correction operation according to the embodiment of the present invention will be described in detail with reference to FIG.

The control unit 220 can control the time second correction unit 212 to correct and compensate for the error time based on the time information acquired from the master device 100. [ The second control unit 220 can control to transmit and receive data based on the corrected time.

The second storage unit 230 may store data that can be transmitted and received between the master device 100 and devices connected to the network. The second storage unit 230 stores time information acquired from the master device 100 or devices connected to the network, stores the time correction information data and the corrected time information to be corrected by the second time correction unit 212 . The time correction information data stored in the second storage unit 230 may include a correction constant according to time information received from the master device 100, The second storage unit 230 may store the corrected time information and the corresponding correction constants.

As described above, the data transmission / reception operation according to the embodiment of the present invention will be described in detail with reference to FIG. 3 to FIG. 5 based on the configuration of the apparatus according to the embodiment of the present invention.

FIG. 3 is a flowchart illustrating a data transmission / reception operation of the first device according to the embodiment of the present invention, and FIG. 4 is a flowchart illustrating a data transmission / reception operation of the second device according to the embodiment of the present invention.

3, the first controller 100 of the master device 100 according to an embodiment of the present invention can record data to be transmitted to the slave device 200 in a transmission buffer. (S310)

The first controller 120 may enable a chip select (CS) signal when data is written into the transmit buffer (S320)

The first control unit 120 may determine whether the enable signal of the slave device 200 is enabled (S330)

The first controller 120 may generate a clock signal in the first oscillator 111 if it is determined that the enable signal is enabled to enable data reception from the slave device 200. In operation S340,

The first control unit 120 may transmit the data recorded in the transmission buffer to the slave device 200 based on the generated clock signal.

The data transmission / reception operation of the slave device 200 for transmitting / receiving data according to the operation of the master device 100 will be described with reference to FIG.

4, the slave device 200 may record data to be transmitted to the master device 100 in the transmission buffer based on the control of the second controller 220 (S410)

The second controller 230 may determine whether the CS signal of the master device 100 is enabled when the data writing into the transmission buffer is completed (S420)

The second controller 230 of the slave device 200 may transmit the enable signal to the slave device 200. The second controller 230 may enable the enable signal if it is determined that the CS signal of the master device 100 is enabled The enable signal is enabled if the CS signal of the master device 100 is enabled to transmit the data written in the buffer to the master device 100. [ Thus, the master device 100 can receive or transmit data.

The second controller 230 may generate a clock signal in the second oscillator 211 when the enable signal is enabled. And can transmit or receive data based on the generated clock signal of the second oscillator 211.

At this time, according to the embodiment of the present invention, the second device, that is, the slave device can confirm the time information of the master device included in the data received from the master device and correct the time of the slave device based on the confirmed time information .

Hereinafter, a method of time synchronization between apparatuses according to an embodiment of the present invention will be described in detail with reference to FIG.

5 is a flowchart of the time synchronization operation between devices according to the embodiment of the present invention.

Referring to FIG. 5, the first device 100 and the second device 200 according to an embodiment of the present invention can perform time synchronization between devices based on time information included in data transmission / reception between the devices described above.

The first device 100 and the second device 200, i.e., the master device 100 and the at least one slave device 200, can initialize the time information of each device to perform time synchronization. (S502 )

When initialization of the time information of the master device 100 and the slave device 200 is completed, mutual data between the devices can be transmitted and received as described with reference to FIGS. 3 and 4. (S504)

At this time, the slave device 200 can confirm the time information of the master device 100 included in the data received from the master device 100. (S506)

The slave device 200 transmits the time information of the slave device 200 to the slave device 200 based on the time information included in the data of the master device 100 received last when data transmission / reception with the master device 100 is completed, (S508).

The time information of the slave device 200 can be corrected by the following equation (2).

&Quot; (2) "

1) -? X (second device time - first device time), (0 <? <1), and the second device_Time [

The time of the slave device 200, which is corrected based on the time information of the master device 100 at the time of completion of data transmission / reception as in Equation (2), is calculated based on the time of the slave device and the time of the slave device, Can be calculated as a difference with respect to a value obtained by multiplying the difference in time by a correction constant ([alpha]). At this time, the correction constant alpha may be a value between 0 and 1.

As described above, the slave device 200 corrected by Equation (2) can count time based on the corrected time until the next data transmission / reception operation is synchronized with the master device 100. In the embodiment of FIG. 5, the second data transmission / reception is performed after the predetermined time Ta or Tb (or the period 1T) after the completion of the first data transmission / reception.

The master device 100 and the slave device 200 can execute data transmission / reception operations after the Ta and Tb times (1T).

When the second data transmission / reception operation is completed, the slave device 200 can re-execute the time correction operation performed when the first data transmission / reception operation is completed.

That is, when the second data transmission / reception operation is completed, the slave device 200 transmits the time information included in the data of the master device 100 received last when data transmission / reception with the master device 100 is completed, that is, (S512)

The slave device 200 can correct the time information of the slave device 200 based on the confirmed time information.

The time correction of the slave device 200 after the second data transmission / reception can be executed based on the above-mentioned equation (2).

At this time, the time received from the master device 100 may be a time added to the time information transmitted at the time of the first data transmission / reception, that is, the second data transmission time, i.e., Ta time.

Therefore, the time of the slave device 200 can be corrected by the following equation (2).

The second device time [2] = the second device_Time [2] -? X (the second device time? First device time) = 2Tb-? X (Tb-

That is, the time of the slave device 200 at the time when the second data transmission / reception operation performed at the time Ta and Tb elapses after the first data transmission / reception is calculated by adding the time increased at the corrected time at the first data transmission / reception .

The master device 100 and the slave device 200 can execute the third data transmission / reception operation based on the operation as described above after Ta, Tb (2T) (S516)

As described above, the master device 100 and the slave device 200 perform data transmission and reception, and the slave device 200 corrects the time based on the time information included in the data received from the master device 100 , And can perform time synchronization with the master device 100. Therefore, the time when the slave device 200 has performed the data transmission / reception and the time correction with the master device 100 n times can be defined as the following formula (3).

&Quot; (3) &quot;

Figure 112015036436798-pat00001

According to Equation (3), the master device 100 and the slave device 200, that is, the first device and the second device send and receive data, and the second device receives the time based on the time information of the first device As the number of times of correction (n) increases, the time error between the first and second devices

Figure 112015036436798-pat00002
. That is, the error can be converged to a value obtained by dividing the difference (Tb-Ta) of the data transmission / reception cycle between the first and second devices by the correction constant (?).

Further, the correction constant alpha may be set to a value between 0 and 1. The correction value may become larger as the correction constant (alpha) is approximate to 1. Therefore, when a temporary error occurs, the variation value for error correction may become large. Further, the closer the correction constant alpha is to 0, the more the error value can converge to zero. Therefore, when the error between the first and second apparatuses or between the apparatuses is equal to or greater than the reference error, the correction constant a is set to an approximate value of 1 to perform the time correction. When the error is less than the reference error, The time correction can be performed by setting it to an approximate value.

It should be noted that the embodiments of the present invention disclosed in the present specification and drawings are only illustrative examples of the present invention and are not intended to limit the scope of the present invention. That is, it will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible.

1000: Data transmission / reception system
100: first device (master device)
110: first communication section
111: first oscillator 112: first time correction unit
120: first control section
130: First storage unit
200: Second device (slave device)
210:
211: second oscillator 212: second time correction unit
220:
230: second storage unit

Claims (10)

  1. Receiving data from a first device;
    Identifying time information of the first device included in the received data;
    And correcting the time error based on the identified time information,
    The correction of the time error
    (Second device_Time [1]) for a value obtained by multiplying the time error value of the second device and the first device by a correction constant ([alpha]) according to the time error value, The time is expressed by the following equation,
    1) -? X (second device time - first device time), (0 <? <1), and the second device_Time [
    And the elapsed time is added to the corrected time (second device_Time [1]) when data transmission / reception after completion of the critical time (Ta, Tb) after correction of the time error is completed,
    The time error corrected value
    Is determined based on the correction constant (?) And the number of corrections (the number of data transmission / reception times) (n) when data transmission / reception with the first device is executed n times and expressed as the following equation
    Figure 112016113642198-pat00010
    Time synchronization method.
  2. The method according to claim 1,
    The step of receiving data from the first device
    And when the CS signal is enabled from the first device, enabling the enable signal to transmit / receive data based on the clock signal.
  3. The method according to claim 1,
    And initializing predetermined time information before the time error correction.
  4. The method according to claim 1,
    The correction of the time error
    Wherein the time synchronization information is executed based on time information of the first device included in data finally received at the time of data transmission / reception with the first device.
  5. delete
  6. The method according to claim 1,
    And storing the corrected time information and a corresponding correction constant.
  7. delete
  8. The method according to claim 1,
    Wherein the correction constant (alpha) is set to an approximate value of 1 when the time error range with the first device is equal to or larger than the reference value, and the correction of the time error is executed.
  9. delete
  10. The method according to claim 1,
    As the number of times (n) that the time is corrected based on the time information of the first device increases, the time error with the first device becomes
    Figure 112016113642198-pat00004
    Time synchronization method.
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EP16164153.5A EP3082282A1 (en) 2015-04-14 2016-04-07 Method for time synchronization
US15/095,551 US10263760B2 (en) 2015-04-14 2016-04-11 Method for time synchronization
CN201610225397.3A CN106059697B (en) 2015-04-14 2016-04-12 Method for time synchronization
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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120300859A1 (en) * 2011-05-27 2012-11-29 Cisco Technology, Inc. Precision Timing in a Data Over Cable Service Interface Specification (DOCSIS) System

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4215380A1 (en) * 1992-05-11 1993-11-18 Siemens Ag Synchronisation system for local clocks with automation modules - performs synchronisation operation when difference between local unit and central unit is less than transmission and processing time of central unit
US5566180A (en) * 1994-12-21 1996-10-15 Hewlett-Packard Company Method for recognizing events and synchronizing clocks
JP2000285069A (en) * 1999-03-31 2000-10-13 Copyer Co Ltd Synchronous serial communication method and system
US7251199B2 (en) * 2001-12-24 2007-07-31 Agilent Technologies, Inc. Distributed system time synchronization including a timing signal path
DE102004028071B3 (en) 2004-06-09 2005-11-03 Siemens Ag Decentralized time interval synchronization in distributed networks
CN100407796C (en) 2005-03-17 2008-07-30 华为技术有限公司 A method and apparatus for adjusting a program clock reference
TWI334547B (en) * 2007-06-07 2010-12-11 Via Tech Inc System and method for serial peripheral interface data transmission
KR20090059471A (en) * 2007-12-06 2009-06-11 에스케이 텔레콤주식회사 Mobile communication system for time synchronization
JP5243786B2 (en) * 2007-12-28 2013-07-24 サンリツオートメイション株式会社 Remote I / O system and time synchronization method in remote I / O system
US8473638B2 (en) * 2008-05-02 2013-06-25 James Aweya Method and apparatus for time and frequency transfer in communication networks
US8308205B2 (en) * 2008-07-31 2012-11-13 D & D Group Pty Ltd Toggle latch
US8213406B2 (en) 2010-04-12 2012-07-03 Motorola Mobility, Inc. Uplink time synchronization in a communication system
CN101834712B (en) 2010-04-19 2012-11-14 浙江大学 Method for realizing accurate time synchronization by utilizing IEEE1588 protocol
EP2424136B1 (en) * 2010-08-24 2013-10-02 Siemens Aktiengesellschaft System and method for time synchronization in a communication network
CN102412954B (en) 2011-11-19 2014-10-22 西安邮电学院 One kind of networking clock frequency synchronization method points
CN104247529B (en) 2012-03-02 2018-05-25 富士通株式会社 Node and communication control method
JP2014096853A (en) 2014-02-13 2014-05-22 Mitsubishi Electric Corp Time synchronization device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120300859A1 (en) * 2011-05-27 2012-11-29 Cisco Technology, Inc. Precision Timing in a Data Over Cable Service Interface Specification (DOCSIS) System

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